Merge files with multiple submissions in the second dataframe error (by.y, y) : 'by' must specify a uniquely valid column

I am trying to merge two data frames from ODK, the first is a household register and the second one is a repeat household register that contains information on the individual members of the family. The variable that links the two dataframes is PARENT KEY. However, using the logic of the repeat household register, this means that one submission in the main form (household register) is having multiple submissions in the repeat form.

How would I proceed to merge these two dataframes?

Below is the codes I have used:

 family_repeats_merged <- merge(family_register_repeats, family_register, by = "PARENT_KEY") %>%
   select(`PARENT KEY`, `today`, `data_type-type_of_submission`)

The results (error message I get is):

Error in, y) : 'by' must specify a uniquely valid column

Seems to me you are being inconsistent as to whether there is an underscore in the name or a space

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